Question

我有一个驱动程序频道，可以将其位置广播到供应商频道。

defmodule MyApp.DriverChannel do
    #...

    def handle_in("transmit", payload, socket) do
      MyApp.Endpoint.broadcast! "vendors:lobby", "track", payload
      {:noreply, socket}
    end
end

defmodule MyApp.DriverChannelTest do

  #....

  test "location broadcasts to vendors:lobby", %{socket: socket} do
    push socket, "transmit", %{"hello" => "all"}
    assert_broadcast "track", %{"hello" => "all"}
    # Want something like this
    # assert_broadcast "vendors:lobby", "track", %{"hello" => "all"}
  end

end

这个断言会失败，因为它只检查来自DriverChannel的广播，如何断言广播到VendorChannel，我查看了源代码，似乎没有选项通过一个channel_name到assert_broadcast宏。

[另一个注意事项]我也有控制器制作的广播，如果我知道答案，我也可以断言那些广播！：）

Answer 1

assert_broadcast仅适用于订阅的主题，但您可以直接通过MyApp.Endpoint.subscribe / 2和assert_receive订阅：

test "location broadcasts to vendors:lobby", %{socket: socket} do
  MyApp.Endpoint.subscribe(self, "vendors:lobby")
  push socket, "transmit", %{"hello" => "all"}
  assert_broadcast "track", %{"hello" => "all"}
  assert_receive %Phoenix.Socket.Broadcast{
    topic: "vendors:lobby",
    event: "track",
    payload: %{"hello" => "all"}}
end

Answer 2

您需要的新版本self

订阅：MyApp.Endpoint.subscribe("vendors:lobby")
取消订阅：MyApp.Endpoint.unsubscribe("vendors:lobby")

如果您没有“取消订阅”，您将收到警告：

[warning] Passing a Pid to Phoenix.PubSub.subscribe is deprecated. Only the calling process may subscribe to topics

新代码：

test "location broadcasts to vendors:lobby", %{socket: socket} do
  MyApp.Endpoint.subscribe("vendors:lobby")
  push socket, "transmit", %{"hello" => "all"}
  assert_broadcast "track", %{"hello" => "all"}
  assert_receive %Phoenix.Socket.Broadcast{
    topic: "vendors:lobby",
    event: "track",
    payload: %{"hello" => "all"}
  MyApp.Endpoint.unsubscribe("vendors:lobby")
end

如何测试从不同频道或控制器对频道进行的广播？

2 个答案: